Brake Conversion On '93 ACCORD LX, Rear How?

[Joshua]

I want to convert all my brakes from my '93 Accord LX, came with rotors at front and drums in the back, non-ABS. Came across with two websites of how to the front brakes but I want to be using the Legend calipers ( http://www.ozhonda.com/forum/showthread.php?112074-DIY-CB-Accord-Rotor-over-Hub-Conversion-282mm-Rotor-Upgrade ) and ( http://www.v6performance.net/forums/showthread.php?p=1799793 ). I know that some 90-93 Accords came with rear disk and that I could put this/fits on my car. The question is: Do I have to replace the Master cylinder,booster,etc. for a better one? And, if I have to add the 4040 brake proportional valve non-ABS and if how you do this? I have checked online and it said that is better to put the prop valve scenes is going to be all 4-disk. Help please. Thanks.